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The study of d(d,p)t reaction is very important for the nucleosynthesis inboth standard Big Bang and stellar evolution, as well as for the future fusionreactors planning of energy production. The d(d,p)t bare nucleus astrophysicalS(E) factor has been measured indirectly at energies from about 400 keV down toseveral keV by means of the Trojan horse method applied to the quasi-freeprocess $\rm {}^2H({}^6Li,pt){}^4He$ induced at a lithium beam energy of 9.5MeV, which is closer to the zero quasi-free energy point. An accurate analysisleads to the determination of the $\rm S_{bare}(0)=56.7 \pm 2.0 keV \cdot b$and of the corresponding electron screening potential $\rm U_e = 13.2 \pm 4.3eV$. In addition, this work gives an updated test for the Trojan horse nucleusinvariance comparing with previous indirect investigations using $\rm{}^3He=(d+p)$ breakup.

New measurement of the d(d,p)t reaction at astrophysical energies via the Trojan-horse method